Auction 333-341 Europe & Overseas Americas (North, Central & South America) - Day 1

1931: Air Post Stamps, 15 c. on 20 c. on 25 c. olive green, unused, block of four, variety '15 c.' blue overprint 'inverted' and also '1391' error of date (instead of '1931') on first stamp, unfresh gum, incredibly rare double variety, signed by Sanabria. Sanabria 17a & 17c = $500++ in 1966 unpriced with both varieties and unlisted in Scott. Ex the Brian Moorhouse Estate.